Improved mode of attaching door-knobs to their spindles



UNITED STATES,

PATENT EEICE.

IMPROVED MODE 0F ATTACHING DOOR-KNBS T0 THEIR SPINDLES.

Specification forming part of Letters Patent No. 35,924, dated July 22,1862.

To @ZZ whom 'it may concern: v

Be it known that, I, G. N. CUMMINGs, of Meriden, in the county of New Haven and. State of Connecticut, have invented a new and Improved Door-Knob; and I dov hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this speciiication, in which- Figure l represents a sectional side elevation of my invention. Fig. 2 is atransverse vertical section of the same taken in the plane indicated by the line m zr, Fig. 1. i

Similar letters of reference in both views indicate corresponding parts. j

This invention consists in the arrangement of a sleeve with a square socket-,in combination with a screwthread cut into one of the knobs and screwing on the end of the rod connecting the two knobs, and with a square projection on the inner end of the shank of said knob corresponding to the square socket in the sleeve in such a manner that by means of the screw-thread in the knob and on the end of theconnecting-rod the distance of the two knobs can be exactly adjusted to the thickness of various doors, and at the same time, by the action of the square socket in the sleeve and of the corresponding projection on the shank of the knob a spontaneous turning of said knob is prevented.

To enable those skilled in the art to make and use my invention, l will proceed to describe it.

The two knobs A A are connected by a rod, B, in the usual manner. This rod is square, and the knob A is provided with a square socket corresponding to the rod, and -it is secured to one end of the same by means of a set-screw, a, which passes through the shank of said knob, and the point of which projects into a cavity made for this purpose in the rod, so as to give a firm hold to the screw and to prevent the knob slipping on the rod.

The knob Ahasa round hole drilledthrough its longitudinal center extending from the inner end of its shank b nearly through its entire length, and a screw-thread, c, is out into this hole to .correspond to a screw-thread, c',

cut on the end of the rod B. By these means the distance between'the two knobs A A can be increased or diminished simply by turning the knob A in one direction or in the other, andthe length of the rod B can be adjusted with perfect eXactncss to doors of different thickness.

C is a sleeve made of brass or any other suitable material and perforated by a square hole, so that it slips easily on the rod B. That end of said sleeve which faces the knob A is provided with a square socket, d, and a corresponding projection, e, is caston the inner endaof the shank b, so that by turning the knob to the proper position the sleeve can be pushed over the end of the shank, as clearly shown in Fig. l of the drawings.

It is obvious that if the socket in the sleeve is thus made to catch over the square proj ection on the shank the knob A is prevented from turning, and it cannot be turned untilV the sleeve is pushed back clear of the projection e.

In order to adjust the length ofthe rod B it is only necessary7 to take oft' the knob A and to push the rod through the door and see if the length of the rod wants to be increased or diminished. By turning the knob A `i'n the proper direction the proper length is at tained and the knob A is now fastened by the sleeve, the rod is pushed through the door, and the knob A is fastenedby means of the set-screw a, and the desired work is accomplished. Y

I am aware that screws passing through the outer ends of the knobs and screwing in or on the ends of the connecting-rod have been previously used for the purpose of adjusting the length of said rod. If the knobs are fast cned by such means their faces are mutilated by the screws, and, furthermore, the screws are apt to become loose after a certain length of time and to turn spontaneously, so thatthey require a continuous attention.

By my improvement the faces of the knobs are left intact, the length of the rod can be adjusted with perfect accuracy, and a spjontaneous turning of the knob and consequent change in the length of the rod is effectually prevented.

Having thus fully described my invention, of screw-threads c c', as and for the purpose what I claim as new, and desire to Secure by herein shown and described. Letters Patent, iS-

The employment or use of a sleeve, C, with G' N GUMMINGS' a Squaresockeb, d, in combination with a square projection, e, 0n the end of knob A, said knob being secured to the rod Bby means',

W'itnesees:

J. W. MILES, JOHN PARKER.l 

